Drill steel retainer



Nov. 2:2, 1932.

R. A. NoRLlNG 1,888,685

DRILL STEEL RETAINER i Filed Nov. 28, 195o ATTORN .r.

Lio

Patented Nov. 22, 1932 i UNITED/STATES Y lIIYLA'IIG.TOOL CO., 0FV CHICAGO, ILLINOIS, A CORPOBATIONOF DELAWARE I DRILL STEEL RETAINER Application led November 28, 1930. 'Serial/No. 498,721.

Y .This invention relates to a drill steel retainer for impact tools andmore particularly vfor portable pneumatic tools of the relatively large pavement or concrete breaker type.

i The main object of the invention is to provide a simple yet durable and strongretainer construction as required for tools of the type referred to, and also to provide a retainer` which can be `'conveniently and'easily operated by theV operator of the tool to release as well as retain the drill steel or other work.- ing element in the tool.`

Another object of the invention is to prol vide a retainer in which the operable member for releasing thedrill steel from the tool or retaining it inthe tool is movably mounted onV the exterior of the tool in position always accessible by the operatorrfor movement into or out of drill steel releasing or'holding position.

Another `object of the invention is to prof -videlmeans forv holding the operable member :against accidental movement when in either of its two positions', andto have such means yact automatically on the memberareaching the limits of its aforesaid positions.

i Another object of theinvention is to have -the holding elements of the retainer housed `and concealed by the operable member vso that said elements will be protected and Vnot injured on contact of the toolwiththe work or surrounding objects A Specically, the retainerstructure of the invention includes asleeve or cam ring as the operable member rotatably mountedl on the snoulderin the form of a collar on the portion of the drill steelwith the nozzle to either release the drill steel orretain it inthe tool.

Vmovement which can be given to the sleeve and also to hold the sleeve from accidental ',turning when 'at the limit of either of its two jpositions. f

`f l The invention consists further in the matters hereinafter describedV and claimed.V 'f

'and 3 the nozzle at the other end of the. barrell for the drill steel d or other working ele- Y 'bar-of the desired shape and size and has its In the accompanying drawing-.f Fig. lis a side view of a pavement breaker equipped with a drill steelretainer of my in.- vention; i

Fig. 2 is an enlarged longitudinal sectional view taken through the nozzle of the tool and the retainer; f r g i Figs. 3 and 4.- are transversesectional .views taken on lines 3f?) and 4,-.-4, respectively, of VFig.2;and

Fig. 5 is a view similarto Fig. `4, showing the retainer in release position.

PATE Nr orFl'cE REINHOLD A. NoRL1Ne,o r AURORA, ILLINoIs, AssreivoR fro INDERRNDRNT' RNEU- o .In the drawing, 1 indicates the barrel of Y the tool, 2 the handle at one-end ofthe barrel,

ment with which the tool may be equipped.

l A wpiston 5 is reciprocatedv in the barrel 1; as

in'tools of thisfcharacter, through the actuation of. a valve (not shown) at the handle end of the barrel. VAn anvil block `6 is located in the nozzle 3 between the piston 5 and drill steel 4, andimparts the blow .of thepiston i fon its power stroke tothe drillsteel. .The barrel, nozzle and handle partsof .the tool aresecured together.` in alinement byzlong bolts 7, at the sides of thetool, as shown vin Fig.V 1. 1 Y v v. Y f The drill steel `4 is in the form of along inner or upper end portionrzslidablyltted in the nozzle 3, as shown in Fig. 2.. `The bore offthenozzle at its outer end is enlarged Vto accommodate an outwardly extending collar 8 on the drill steel which collar provides v exterior of the nozzle ofthe tool to control the-projection of retainer4 elements inthe form of ballscinto and outof the path of a a shoulder with whichthe retainer vcooperates to hold the drill steel in the tool.

`retainer elements which as shown inithe` drawing are in the form of balls V9,located in holes 1Q, 10 in the nozzle in advance of the 4' shoulder or collar 8 on the drill steel: The

holes 10 extend through thenozzle Vso that the balls 9 may project into the same :inad` out of thejnozzle when out offcontactwitlr the work. The retainer elements 9 are heldV 'inthe position referredy to'by an annular l:

`member 11 in the forni of a sleeve or ring rotatably fitted on the outside of the nozzle over the balls. Sleeve 11 has a number of internal recesses or cavities 12, one for each lball 9, so that when the sleeveis turned to position 4.its recesses opposite theballs, the latter may enter .the recesses to releasev the drill steel 4 vfrom the nozzle. The balls 9 will be forced into these recesses by the collar 8- asit passes theballs on withdrawing-the drill steel from the tool. To aid in thisaction,

the collar 8 has an inclined outer surfacevl?)` to engage the balls as it is drawn past them.

The inner surface portions 14 ofthe .sleevey 11 between the recesses 12 fit against the outer surface ofthe nozzle 3- and when turned over they outer ends of the holes 10 prevent movement ofthejballs kfromthe collar Sand thus retain the drill steel in the nozzle. As shown invzFi'gs. 3 and 4, they retaining balls 9" are arranged in' the samel general plane and are spaced about the axis of the nozzle so as to project fintothepathof the collar atk a lnum-V ,ber-offpoints about'the same. 'i

To holdthe sleeve 11 against accidental turning when vin eitherof yits vtwo positions, I provide a detent linthe form of a ball, as show'n yin, Figss4 and 5.. The detent elementor ball .15. .iscarried by the sleeve 11 in ahole lttherein. and extends into. a circum- -ferentially extending groove 17 inthe outer sur-face .of the nozzle under the; sleeve 1'1.

Groove 17 has shallow recesses Tor notches 18, 18 atitsopposite endsto-receivethe detent `ballzl,asshown in Figs.,4 andi.v The detent .balli 1'5is held in its hole 16. andin the'groove 'byV a 'spring clipl 19 which partially .envcircl'esthe sleevelll on the outside thereof in alretaining groove 20, as shown. 1 They clip 19-isheld` from turning on` the sleeve byfshoulders 21:, 21 against whichL theendsoffthe clip engage. In this. way,the;clip cannotturnon 1 the sleeve 11 to release the detent ball.k With 1 the" clip. extending over' the outer portion of the ball?, thelatter may. move outward against.

- ftheclip19 as the sleeve 11; is turned to release Y 'or lock thev drill steel inthe nozzle. Y The ofthe' spring cliprv 19 isreadily overcome Von f manually turning the sleeve 11. Fig.,4 shows i Y the sleevell turned toa position holding the retaining.balls 9 under.KY the collarB, While Figy shows thesleeveturned to a lposition i toyrelease theretainingballs .from the collar.

The `sleevellil fits freely on the'nozzleland is prevented: from moving up.- 'on; the. same byfa-shoulderg22fon; the nozzle at' the inner lor upper end of thesleeve. The shoulder provides a solid abutment on Ythe nozzle for the sleeve and holds the sleeve against upward n movement on the nozzle due to the inertia of the sleeve by the jars produced throughV the impacts of the drill steel onthe retainer means in the operation of the tooL With the sleeve so held, the detent 15 is notrequired to hold the sleeve .against these jars and thusisV not 'subject to any appreciable wear. The sleeve is prevented from--moving off the nozzle in the opposite direction by the detent ball '15 carried by the sleeve extending intoA the groovelf .in the nozzle. The recesses 12 1n the sleeve* 11, as shown inthe drawing,

ballswill have a. cam. action. thereon to move 'tliemfiin-to: the bore` of the nozzle for drill steel retaining purposes. TheI clipf1i9.. extends more than halfway around the nozzle and sare,v curved to vaccommodatev the balls 9-,and are lmade largerthan-` the balls, sof thatv the 4wallsof the Yrecesseswhen turned-against the being of the split type and made of; spring metal maybe-readily slipped on and off. the lnozzle in the assemblyingand: disasemblying of the retainer. The ends 'ofthe clip are turned outward so as to" easilytride: overthe surface of lthe nozzle when applying and removing the clip. Y The` shoulders21are the ends of thegroovejll vand are'f-ormedbyI thatv portionf o f the' nozzle.

- The space- 22Zt inwhichthe anvil bloclc 6 has; movement is shorter .th-antl'le distance, between the retainingk balls 9 and a shoulder i 23 lat the inner end ofthe bore ot tlenozzle inv-which? the collar Y81 is?V located..V Lhisiarfl rangement" permits the vr`anvil block underv a blow'ofthe piston!Y to hitthe-'nozzle before therebyfrellieving the same of any direct impaetof the piston. f The detentfballf 15 is smaller than thelret'aineriballs 9, andisjofset' toone side oftheflatter as shown im Fi'gf.. 2.

required for pavement and concrete breaker type of tools. The turnability-` ofy thelsleevevv 1'1 into andout ofthereleasingv and'Y holding positions, with the sleeve being st'oppedl when# The retainer of my invention; is simple, no

yet strongl and2k durable ine construcinon as i 'reaching these positions, allowsL for a lconv venient and quickV -lockfingandnnjloelringf Yof) i' the retainer devicei` M "oreover,v` withifjtlie active elements 9 and'15' of theretainercornpletely housedby the sleeve"11,"theflatterWV 'protects thel same from injury by' vcontact v with fthe work, asjwhen the .tool ,isljaid on the, same' orwdragged overfi-t. Y 'TheY sleevel-l alsoxprotects these parts from contact wifthfKV surroundinglob'jectsas the vtool isiliaj'ndljediY and transported i from;V place to, place. Fur,-

'thermore, the retainer is in keeping witltlie cylindrical design ofthe. tool. ,and`. vvith. no

'partefrrisctinafromifhftodi-,they.areinomw mo y ,the v@011m contaetswith. theremining 108,113,105 i subject to injury nor do they give an unsightly appearance to the tool.

The details of construction and arran ement of parts shown and described may e variously changed and modified Without departing from the spirit and scope of my invention, except as pointed out in the appended claim.

I claim as my invention:

A drill steel retainer for impact tools, comprising in combination with the nozzle of the tool. and drill steel insertable into the nozzle, of means providing a shoulder on the portion of the drill steel Within the nozzle,

retainer means carriedv by the nozzle and projectable into the same in advance of said y shoulder, a sleeve rotatably mounted on the nozzle for controllingthe projectability of the retainer means into thenozzle, a spring pressed detent carried by the sleeve andfextending into a circumferential groovein'the l nozzle to limit the extent of rotation of the sleeve, and a shoulder on the vnozzle above the sleeve, said shoulder forming a -solid abutment for the sleeve to prevent upward movement of the same on the nozzle due to inertia through the impacts ofthe drill steel on the retainer means in the operation of the` tool. t

In testimony whereof I aix my signature.

REINHOLD A. NORLING. 

